Bispyribac Sodium

Aquatic Bispyribac Sodium Herbicides for Lakes and Ponds

Bispyribac sodium was conditionally registered with the EPA for aquatic use in 2011.The active ingredient is sodium 2,6-bis[(4,6-dimethoxypyrimidin-2-yl)oxy]benzoate. Tradewind™ are the formulations registered for use in aquatic systems. It is used for large-scale or whole water body control of submerged, emergent and floating-leaf vegetation.

Aquatic Use and Considerations

Bispyribac sodium is a systemic herbicide that moves throughout the plant tissue and works by interfering with production of a plant enzyme necessary for growth, acetolactate synthase (ALS). The concentration in the water column must be maintained for 60-90 days. Repeat treatments can be made if necessary to “bump” up the concentration to the desired levels.

Susceptible plants will stop growing soon after treatment and become reddish at the tips of the plant. Plant death and decomposition will occur gradually over several weeks to months. Bispyribac sodium should be applied in the spring to plants that are actively growing. If applied to mature plants, the effectiveness may be reduced.

A water body should not be treated with bispyribac sodium if there is an outlet, or in moving waters such as rivers or streams. If there is water movement at a treated site, higher concentrations.

Industrial Vegetation Management Knowledge Base 

Biology and Control of Aquatic Plants  
Bispyribac Sodium Chemical Fact Sheet

Note: Products may not be registered for use in your state or locale. Check to be sure a specific use pattern is approved in your area before use. Check product labeling or your local state agency for more information. Most current product labels are available by visiting the product manufacturers website or at

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